SU704817A1 - Method of making fire-protected woodwool panels - Google Patents

Description

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The invention of OTHOCHTCJ to izgrtov methods; The laziness is bis- and fire-resistant fibreboard for construction purposes, and it can be used in the woodworking and pulp and paper industry.

Methods are known for manufacturing bio and flame retardant fibreboard by preparing pulp, blending with a binder containing flame retardant additives, forming a carpet, followed by hot pressing and impregnating the plates with bio and flame retardants.

A known method of manufacturing flame-resistant wood-fibrous plou by sizing a defibrator mass with a hydrophobic additive (paraffion-nephelin or ceresin emulsion), injecting a water-insoluble nepheline antischrea in the form of an aqueous suspension of 20-ZSC | pulverbakelkt. concentration 309 & in the amount of 5-6%. After the stirring, the precipitator is also introduced into the mixture in the form of aluminum-potassium alum and carefully formed, and molded with the purpose of mechanical pressing, drying and quenching by hot pressing at a temperature of 170-180 ° C and a pressure of 6080 kgf / cm (11.

The closest to the proposed method is a method for producing fire retardant wood fiber pieces, including the formation of a carpet with the subsequent application of fire-resistant and bioprotective compositions to it and heat treatment 12.

However, the known methods are characterized by increased consumption of flame retardants and insufficiently good physical and mechanical properties of pcs.

The value of the invention is to increase the flame retardant properties and increase the mechanical strength of pcs.

This is achieved by the fact that the formed carpet is brought to a moisture content of 20-30%, impregnated at a temperature of 20-55 ° C for its entire thickness with a fire and bioprotective composition, which additionally contains a water-repellent agent. and heat treatment at a temperature of 145155 ° С and specific pressure of 0.5-5.0 kgf / cm for 3-6 minutes per i mm thick of the finished plate. The technology obtained by fire retardant fibreboard is as follows. For the manufacture of such plates, a soft MI2 mark (GOST 4598-74) with a moisture content of 20–30% or a formed fiberboard carpet after the casting machine, dried to the same moisture that is immersed in fire and bioprotective material, is used additionally containing a water-repellent agent, and the whole composition is heated to 20 ° C, and the heat treatment process on a hot press is carried out at a specific pressure of 0.5-5.0 kgf / cm for 3-6 minutes per 1 mm thickness of the finished plate, and before hot pressing all excess cocfa after npomiTKH carpet ayut. The mixture at room temperature (20 ° C) has a density of 1.4 g / cm and a VZ-4 viscosity of no more than 30s. Example 1. A fire-bioprotective composition in the form of liquid glass with silica module 2.7, a water-repellent agent and an antiseptic is heated in a bath to 45 ° C, where a wood-fiber carpet, dried to 20% moisture, is immersed. Fire properties: mshkgykh174 Carpet impregnation is carried out for 5 mn throughout the entire thickness of the slab, and the excess composition is squeezed out of the carpet after impregnation. Heat treatment is carried out on a hot press at 150 ° C in t: eCheike 30 min. The thickness of the finished STI is 8 mm, the ratio of fiber and composition in the finished plate is 1: 0.5. EXAMPLE 2 The composition is prepared analogously to example 1. The soft wood fiber rod is moistened to a moisture content of 25% and immersed in a bath with a composition heated to 5–5 ° C on a vacuum impregnation machine (vacuum in the suction chamber 60 mm of mercury.) For 3 min. The heat treatment is carried out in a hot press at 145 ° C for 35 minutes. The ratio of fiber and composition in the finished plate is 1: 1. Froze The composition is prepared as in Example 1. The composition is impregnated in an autoclave at a pressure of 2 atm. Impregnation time 2 min. Excess composition is removed on a roller press. Heat treatment is carried out on a hot press at 155 ° C for 40 minutes. The ratio of fiber to composition in the finished plate is 1: 1.8. The fnziko-mechanical properties of the plates obtained in all three primers are listed in the table. slabs

} The weight loss of the plate (sample) under the action is 0%. . ) At a relative humidity of 100%.

The fire retardant fibreboard of the bio-fire-resistant fiberboard produced by the proposed method is distinguished by increased strength and ease of machining.

Claims (2)

Claims of Invention A method for producing fireproof fibreboard plastics, including the formation of a carpet followed by application to non-mold fungi (GOST 16712-71). , 5704817 fire-resistant and bio-protective compositions and specific pressure, 0 kg / cm in temperature treatment, differing from 3 to 6 minutes by 1 mm of thickness, in order to increase the fireproof slabs, properties and increase the mechanical strength of the plates, the formed carpet is brought to Sources , information, humidity of 20-30%, is impregnated at the rate taken into account in the examination of the temperature of 20-55C for its entire thickness with fire-1. USSR author's certificate number 416251, and bioprotective composition, which supplement-class. B 29 J 5/00, 1972. contains water-repellent agent 2. USSR author's certificate N 467858, processing is carried out at a temperature of 145-155Сюл. At 29 J 5/00, 1975.